Improvement in spark-arresters



E. M. JOHNSON.

sPARK-AR'RESTER.

No.189,228. Patented Apr11s,1877.

ma {Ip/EMDR NMETERS. PMOTO-IJTNOGRAPHER. WASHINGTON, l:4 C.

UNITED STATES PATENT EEIoEa ENOCH M. JOHNSON, OF PITTSBURG,PENNSYLVANIA, ASSIGNOR TO HIM- SELF AND JOHN E. SAIVIPSEL, OF SAMEPLAGE.

IMPROVEMENT IN SPARK-ARRESTERS.

Specification forming part of Letters Patent No. 189,228, dated April 3,1877; application filed January 17, 1877.

To all whom it may concern:

Be it known that I, ENocn M. JOHNSON, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Spark-Arresters; and I do hereby declare the following tobe a full, clear, and exact description thereof, reference being had tothe accompanying drawing, forming part of this specification, in Which-Y Figure 1 is a vertical section of a locomotive smoke-stack with myimproved sparkarrester in connect-ion therewith. Fig. 2 is a perspectiveView of the brackets, showing my invention in another form.

Like letters refer to like parts in each.

My invention relates to that class of de; vices termed spark-arresters,used in connection with locomotive and other stacks 5 and it consists incombining with the stack a series of inverted hollow perforated conicalfrusta, arranged one above the other, so as to obtain deflectin gsurfaces, against which the sparks are thrown by the draft Withoutobstructing the draft.

To enable others skilled in the art to make and use my invention, I willdescribe its construction and operation.

In the drawing referred to, A represents a locomotive-stack, the innersurface of which should be straight and of equal diameter throughout.Upon the rods or bars b b I secure a series ot' perforated conicalfrusta, C G1 O2, in any suitable manner, with the base up. Theseperforated conical frusta or baskets may be made of steel plate, wire,or other suitable substance, and When made of wire the bases of thecones are riveted or welded to rings d attached to the rods b, (as showniu Fig. 2.) l

In order to prevent the baskets from bending l find it necessary in somecases to secure the apex of the cone or basket in a ring, c, which isheld in position by thebolts j', provided at the end with slots t',which slide upon the rods b. In order to adj ust the apex ofthe cone inthe center ofthe stack the bolts fare provided with the jam-nuts h. Whensteelplate baskets are used, however, it is not always necessary to usethe ring e. A t the apex f the baskets O Cl C2 are central openings,through which the induced draft, caused by the exhaust from the engine,passes. These openings should not be smaller` than the exhaust-pipe, sothat the draft shall not be obstructed by the brackets, and when certainkinds ot'fuel are used the openings of the lower basket or baskets arelarger than the upper one, as shown in Fig. 1.

The baskets suspended on the rods b are passed down the top of thestack, and secured therein by the bolts m passing through the rod andstack. The baskets fit close against the stack, and so prevent anysparks from passing between.

I do not limit myself to the number of baskets used, as in some casestwo are sufficient.

The operation of my improved spark-arrester is as follows: The sparkscarried up by the jet-exhaust Will be deiiected against the lowerbasket, and, falling back, will be again caught by the draft, and thrownagainst the basket or carried through the lower one to the next basket,being retained in the stack long enough to die out and be broken intocinder ne enough to pass through the meshes of the baskets, and willthen be carried out of the stack in the form of dead cinder. i

The central openings in the basket are material, and the baskets shouldbe adjusted and arranged. so as to bring the open apices in line, so asto prevent the baskets from materially aifecting either the natural orinduced draft of the stack.

What I claim as my invention, and desire to secure by Letters Patent,is-

' In combination with a stack, a series of inverted hollow perforatedconical frusta or baskets, having central openings arranged within thestack, one above another, substantially as and for the purposesspecified.

In testimony whereof I, the said ENOCH M. JOHNSON, have hereunto set myhand.

- ENOOH M. JOHNSON. Witnesses:

JAMES I. KAY,

I1". W. RITTER, Jr.

